La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Changes in the seasonal pattern of singing and population crash of the River Warbler Locustella fluviatilis in the riverine woodlands along the Lower Inn River
Auteurs :	Josef H. Reichholf, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (43(3) December 2004)
Article en page(s) :	237-241
Résumé :	In the decade from 1961 to 1969, the years of increase of the newly established population of the River Warbler in the riverine woodlands along the lower reaches of the Inn river, Southeastern Bavaria, a second maximum of song activity occurred in July, which attained about half of the magnitude of the main singing period in the 2nd half of May. But it disappeared when there was a marked decrease in the population from 1985 onwards. Fig. I shows the difference in the singing pattern, which is interpreted as an indicator of incidences of second broods or at least regular displacement breeding after clutch losses during the years of population increase and vice versa. During the years in between, the cutting of the Grey Alder forests ceased as well as the removal of ground litter, which probably has led to an undercover much too dense for the ground-moving River Warbler later in the season.

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...